I can't say for sure, but I don't know if ARH is doing anything for the LLT engine, you may call them? They have developed both a high flow catted set of pipes, and an uncatted set of pipes for the LFX.

I don't think gutting the cats will increase the rasp... But then, gutting the cats and using true test pipes will have the same sound effect, never mind if the test pipes were worse.

Interesting so let me think a two 2.5 exhaust pipe is the same as a gutted cat? I think that as far as exhaust flow that incorrect statement. The sound may be the same but the flow is a different matter. Instead of using a piece of exhaust pipe I need the impression a that cats are on the car for inspections.

I've seen some pictures of a gutted cat setup in the v8 section once... The guy actually welded the shell of the stock cats to a new exhaust tube, it looked factory, but was straight through. Would probably pass visual, but I doubt it would pass the sniffer test.

Interesting so let me think a two 2.5 exhaust pipe is the same as a gutted cat? I think that as far as exhaust flow that incorrect statement. The sound may be the same but the flow is a different matter. Instead of using a piece of exhaust pipe I need the impression a that cats are on the car for inspections.